Only a few spots left to join us for the Digiday Publishing Summit

Join us Sept. 14-16 in Miami to connect with top publishing leaders

SECURE YOUR SEAT

‘JG believed that even in a demanding industry, it was possible to lead with both rigor and humanity’

The sad news of John Gentry’s death, the CEO of OpenX, emerged, with the resulting outpouring of respect and tributes testament to his professional standing in the industry and the high regard in which he was held.

In a measure of the thoughtfulness and humanity of Gentry – or “JG” to those that knew and worked closely with him – the developments were made public on January 15 by his own hand.

“If you are reading this, it means that I’m no longer around and lost my fight with cancer,” read a self-penned note on his LinkedIn account. “This note is just a massive thank you to all of you. Thank you for the fun, for sharing the struggle, for helping me learn along the way, and being a group of quality people that enriched my life. I wish you all the very best in the years to come!”

“JG meant so much to so many of us at OpenX, and our thoughts and deepest sympathies are with his family and friends during this difficult time,” read an official note from OpenX, which went on to conclude, “JG believed that even in a demanding industry, it was possible to lead with both rigor and humanity. We will carry that forward.”

Gentry was one of the pioneering executives of ad tech, holding several roles at OpenX since 2012, culminating in a distinguished career that earlier saw him serve at startups, including Spot Runner and Green Dot, as well as at corporate entities such as Disney and Overture.

John led OpenX with a steady hand and an uncommon decency, and to know him was to know that he was one of the good guys. The outpouring of love for the man following his passing is a testament to that. In an industry riddled with egos and hidden agendas, John was someone who wanted to see others thrive. He made himself accessible at the trickiest moments and never treated people as stepping stones.

He believed that businesses grow when people feel trusted and respected, and he built a culture around that belief. Competitors admired him, colleagues relied on him, and younger executives sought him out because he listened more than he lectured.

The advertising world can be transactional and unforgiving. John proved it did not have to be that way. He showed that leadership can be ambitious without being ruthless, and strong without losing kindness.

More in Media

Marketers say usage rights are driving up the price to work with creators

Creator pricing’s biggest hurdle are usage rights, which can create confusion and frustration on every side of the negotiation table.

Media Briefing: What to expect at the Digiday Publishing Summit, September 2026 edition

Here’s a sneak peek at the topics that will be discussed onstage during the Digiday Publishing Summit, September 2026 edition.

A stylized illustration of a retro TV screen displaying a hand holding colorful shopping bags, symbolizing the connection between CTV advertising, retail media, and consumer purchase data.

Location data fuels mall giant Simon’s new pitch to advertisers

Simon is letting brands target shoppers in its malls in other environments and use new measurement tools based on Simon’s consumer data.